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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1227bc355b30071860bfc8a11877030dd0d4025a4bae699de2b9bf1d97878f50' 
  AND token = 'o8AtA8tPxfkiqChuOckSzhm5Djm45d4EJv176j9qlkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}